JCB 155 start logic

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skidsteerboss

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Feb 13, 2025
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Does anyone know what the computer needs to see to open the throttle solinoid to start the engine on a 2013 JCB 155eco?

Engine: Perkins 404D-22T

The engine takes a ton of cranking or starting fluid to start, once it starts, it runs rough for 15 seconds then dies. You start it back up and it purrs like a kitten.

The things I've checked:
Compression - good
Lift pump - good
Throttle solinoid - bench tested good

Voltage to throttle solinoid during cranking is zero.
Once it starts running, it idles at 5v.

For some reason the ecu doesn't want the engine to start as it's not opening the fuel valve.

No codes.

Any help would be great

Thank you
 
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